Water → [2-(4,5-Diiodo-2-methoxymethylimidazol-1-yl)ethyl]carbamic acid tert-butyl ester

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Reaction Steps

To a solution of 4,5-diiodo-2-methoxymethyl-1H-imidazole (3.000 g; 8.244 mmol) in anhydrous DMF (35 ml) was added portionwise, at rt, 55-65% sodium hydride moistened with oil (395 mg; 9.895 mmol). The resulting mixture was further stirred at rt, under nitrogen, for 20 min. The mixture was then heated to 100° C., and a colorless homogeneous solution of 2-(Boc-amino)-ethylbromide (2.032 g; 9.068 mmol) in anhydrous DMF (30 ml) was added dropwise, over 15 min., with an addition funnel. After completion of the addition, the resulting dark-orange homogeneous mixture was further heated at 100° C. for 1 h45. The reaction mixture was cooled to rt, and water (175 ml) was added slowly. This mixture was extracted with ether (4×120 ml). The combined organic layers were dried over anh. MgSO4, filtered, and concentrated to dryness under reduced pressure. The crude was purified by FC (DCM/MeOH=50/1) to give the pure product [2-(4,5-diiodo-2-methoxymethyl-imidazol-1-yl)-ethyl]-carbamic acid tert-butylester as a pale yellow solid which was further dried under HV (3.050 g; 73%). LC-MS: tR=0.87 min.; [M+H]+=508.16 g/mol.

Provenance & Evidence